TinySwitch-PK - Power Integrations
Power Integrations introduced the TinySwitch-PK power supply control IC with peak power mode. The new Power Supply Control chip is able to deliver up to 280% peak
power for short periods of time. This feature enables designers to specify transformers rated for the continuous power level
Functional Block Diagram
Description
TinySwitch-PK incorporates a 700 V MOSFET, oscillator, high- voltage switched current source, current limit (user selectable), and thermal shutdown circuitry. A unique peak mode feature boosts current limit and frequency for peak load conditions. The boosted current limit provides the peak output power while the increased peak mode frequency ensures the transformer can be sized for continuous load conditions rather than peak power demands.
Typical Standby Application.
Special Feature
Automatically enters into a special peak mode - doubling operating frequency and boosting current limit for the duration of the peak power requirement - TinySwitch-PK
Power Supply Control IC coaxes up to 280 percent of the design power level out of the same transformer and integrated MOSFET. The challenge in these systems is to design a power supply that can provide the necessary peaks when needed, but does not burden the application with peak costs.
Features and benefits of TinySwitch-PK Power Supply Control IC includes:
Â¢ Lowest System Cost with Enhanced Flexibility
Â¢ Simple ON/OFF control, no loop compensation needed
Â¢ Unique Peak Mode feature extends power range without increasing transformer size
Â¢ Maximum frequency and current limit boosted at peak loads
Â¢ Selectable current limit through BP/M capacitor value Higher current limit further extends maximum power in open frame applications
Â¢ Lower current limit improves efficiency in enclosed adapter applications
Â¢ Allows optimum TinySwitch-PK choice by swapping devices with no other circuit redesign
Â¢ Tight I2f parameter tolerance reduces system cost:
Â¢ Auto-restart delivers <3% maximum power in short circuit and open loop fault conditions
Â¢ Energy Efficient
Â¢ selectable current limits, allowing the designer to choose any of three current limit values for each family member without any additional IC pins or external components.
Â¢ Enhanced Safety and Reliability Features
Â¢ Very low component count enhances reliability and enables single sided printed circuit board layout
Â¢ excellent transient load response
Â¢ High bandwidth
Daily Applications
Â¢ Traffic Lights
Â¢ Cars
LED daytime running lights of Audi A4
Western Australia Police car using LED
Â¢ House Lighting
LED Tube Lights
LED Christmas Lights
Â¢ Non-visual applications
LED panel light source used in an experiment on plant growth. The findings of such experiments may be used to grow food in space on long duration missions
The light from LEDs can be modulated very fast so they are extensively used in optical fiber and Free Space Optics communications. This include remote controls, such as for TVs and VCRs.
Light can be used to transmit broadband data
Â¢ LED Disco Lights
A large LED display behind a disc jockey.
Other Applications
Â¢ exit signs
Â¢ emergency vehicle lighting
Â¢ LED-based Christmas lights
Â¢ high-mounted brake lights
Â¢ Dropped ceiling with LED lamps
Â¢ backlighting for LCD
Interesting Facts about LED
Â¢ A 13 watt LED lamp produces 450 to 650 lumens [63]. which is equivalent to a standard 40 watt incandescent bulb [64]. A standard 40 W incandescent bulb has an expected lifespan of 1,000 hours while an LED can continue to operate with reduced efficiency for more than 50,000 hours, 50 times
Â¢ A single kilowatt-hour of electricity will generate 610 g of CO2 emissions.[65] Assuming the average light bulb is on for 10 hours a day, a single 40-watt incandescent bulb will generate 89 kg of CO2 every year. The 13W LED equivalent will only be responsible for 29 kg of CO2 over the same time span. A buildingâ„¢s carbon footprint from lighting can be reduced by 68% by exchanging all incandescent bulbs for new LEDs.
Â¢ the average incandescent mini-light uses 5 watts per bulb. An entire string of LED mini-lights uses around 4 watts... Yeah, I said the entire string! Do the math on that one."
Â¢ Regular" incandescent Christmas light bulbs may lose their life after about 1,800 hours, whereas LED Christmas light bulbs will still be twinkling long after 4,000 hours. That's about 7 months of continuous testing!